An inpatient coder assigns ICD-10-CM diagnosis and ICD-10-PCS procedure codes to hospital inpatient records and groups each stay into an MS-DRG — the code that drives Medicare's per-discharge payment to the hospital.
It is hospital-side work: BLS counts hospitals as the largest employer group for medical records specialists, at 28% in 2025, and the unit of work is the whole inpatient stay, not a single office visit.
What does an inpatient coder do?
An inpatient coder reads the medical record for each hospital admission and translates it into standard codes: ICD-10-CM for diagnoses and ICD-10-PCS for the procedures performed during the stay.
AAPC says its Certified Inpatient Coder (CIC) credential validates exactly this work — assigning ICD-10-CM and ICD-10-PCS codes and applying MS-DRG principles.
BLS puts the work inside medical records specialists (SOC 29-2072) — the closest available federal group for coders, one that also includes records staff who do not code.
The occupation, as BLS defines it, compiles, processes and maintains patient files, and may classify and enter patients' medical information into the healthcare industry's numerical coding system.
Medical coders specifically, BLS says, assign the diagnosis and procedure codes for patient care, population health statistics and billing purposes.
BLS's duty list includes reviewing patient records for timeliness, completeness and accuracy, and using classification systems to assign clinical codes for diagnoses, procedures and services.
O*NET adds the task that makes the inpatient side distinct: assigning patients to diagnosis-related groups (DRGs) using computer software.
The DRG is the number the hospital cares about.
Under Medicare's inpatient prospective payment system (IPPS), CMS classifies each case into an MS-DRG using the principal diagnosis, up to 24 additional diagnoses and up to 25 procedures performed during the stay.
It then pays the hospital a rate per discharge that varies by the DRG assigned.
When documentation is unclear, the coder goes back to the people who wrote it.
BLS says medical records specialists meet with healthcare workers such as registered nurses to clarify diagnoses or get additional information.
O*NET lists resolving or clarifying codes or diagnoses with conflicting, missing or unclear information by consulting doctors or coding-team meetings.
The pace follows the facility.
Most medical records specialists work full time, BLS says, and in facilities that are always open, such as hospitals, they may work shifts, including nights or weekends.
BLS also flags detail orientation, discretion with patient data, and the interpersonal skills to discuss discrepancies with physicians and finance staff as qualities the work draws on.
How inpatient coding differs from pro-fee coding
The dividing line is whose services sit on the claim.
Professional-fee (pro-fee) coding covers physician and other outpatient services — the scope AAPC gives its CPC credential — while facility inpatient coding covers the hospital's own inpatient stays, coded in ICD-10-CM and ICD-10-PCS and grouped into MS-DRGs.
The code sets differ accordingly.
CMS says the industry transitioned from ICD-9 to ICD-10 for diagnoses and inpatient procedures on October 1, 2015, and that ICD-10 applies to all parties covered by HIPAA.
ICD-10-CM diagnosis codes and ICD-10-PCS procedure codes update every October 1 — the most recent updates took effect October 1, 2026.
The exams track the split.
During the CPC exam candidates may reference only approved code books: the AMA's CPT Professional Edition plus their choice of ICD-10-CM and HCPCS Level II books.
The CIC, by contrast, validates assigning ICD-10-CM and ICD-10-PCS codes and applying MS-DRG principles, and AAPC says it also covers recognizing insufficient documentation and understanding when provider clarification is needed.
Payment mechanics complete the contrast.
CMS pays inpatient hospital services under the IPPS at a rate per discharge that varies by the DRG to which the stay is assigned, so the coder's group assignment drives the payment for the whole admission.
On the outpatient facility side — same-day surgeries, emergency department visits and hospital outpatient clinic services — AAPC's COC is the credential that validates the work.
In short: moving from pro-fee to inpatient means learning a new procedure code set, DRG logic, and the whole hospital stay as the unit of work.
The ICD-10-CM diagnosis side carries over from pro-fee work; ICD-10-PCS and DRG logic are the new ground.
Credentials: the CCS, the CIC and experience
Two credentials matter here.
AAPC counts the CIC among its four main core coding certifications — the CPC, COC, CIC and CRC, with the CPB separate for billers.
AHIMA's CCS (Certified Coding Specialist) is the other: AHIMA counted 36,925 certified CCS professionals as of December 31, 2025.
AHIMA's own guidance builds experience in before the exam.
One of its recommended — not required — CCS preparation routes is a minimum of two years of related coding experience directly applying codes.
The exam runs 107 questions, 97 scored and 10 pretest, with four hours allowed, and AHIMA says it must be scheduled at a Pearson VUE testing center.
AHIMA listed the cost at $299 for members and $399 for non-members as of October 13, 2026, with retakes the same.
AAPC says the vast majority of its certification exams are 100 questions in a four-hour format; confirm the CIC's current exam details with AAPC before you register, since formats change.
Taking an AHIMA certification exam is voluntary per AHIMA's candidate guide.
BLS adds that certification may be required or preferred for medical records specialists, and that employers may prefer certified applicants or expect certification shortly after hire.
The education base matches coding generally.
BLS says medical records specialists typically need a postsecondary certificate to enter the occupation, although some qualify with a high school diploma and others need an associate's or bachelor's degree.
Community college and technical school certificate and associate programs typically include medical terminology, health data requirements and standards, and classification and coding systems.
Confirm credential details before you register
Remote inpatient coding
The remote story for inpatient coding runs through AAPC's salary survey: in its 2025 survey, 64.8% of respondents worked fully remote, 19.8% fully on-site and 15.4% hybrid.
That is a self-selected, mostly AAPC-member sample of workers — not a count of job postings.
The shift is recent on AAPC's own account.
Before 2020, only 30–33% of its salary-survey respondents worked remotely, and AAPC says remote work used to be reserved for the most experienced employees.
What the research behind this page did not find is a verified share of inpatient coding postings that are remote.
Treat any precise figure you see elsewhere with care, and read live postings instead: current inpatient coder jobs are collected on our job board.
Two practical notes if you compare remote roles.
BLS's shift caveat applies to on-site hospital staff: in facilities that are always open, such as hospitals, medical records specialists may work shifts, including nights or weekends.
And productivity measurement and remote-access arrangements are employer-specific, so the posting and the interview process are where a given team's expectations surface.
How coders move into inpatient coding
The credentials' own experience routes sketch the path in.
AHIMA recommends — without requiring — a minimum of two years of related coding experience directly applying codes before the CCS.
BLS's entry picture for the occupation — typically a postsecondary certificate, although some qualify with a high school diploma and others need an associate's or bachelor's degree — is where coding careers start.
Community college and technical school certificate and associate programs typically include medical terminology, health data requirements and standards, and classification and coding systems — the vocabulary ICD-10-PCS and DRG work assumes.
AHIMA frames its two-year route as experience “directly applying codes,” which is the inpatient experience gap new coders close on the job, in a coding role that touches the inpatient record.
Coders already working pro-fee or outpatient roles bring transferable pieces: the ICD-10-CM diagnosis side, record-review habits, and the provider-clarification judgment the CIC explicitly tests.
ICD-10-PCS procedure coding and MS-DRG logic are the new ground.
Inpatient experience also leads onward.
AAPC says its CDEI credential suits professional coders working in hospitals or inpatient facilities who want to move into CDI roles.
ACDIS describes CDI specialists as understanding complications, comorbidities, severity of illness, risk of mortality, case mix and the impact of procedures on the billed record — the clinical and payment picture inpatient coders work with daily.
Inpatient coder pay
Two pay sources cover inpatient coding, and they measure different things.
BLS reported a median annual wage of $51,140 for medical records specialists in May 2025 — the closest available federal group for coders, an occupation that also includes records staff who do not code.
Among BLS's industry medians for the occupation: hospitals $59,120 and offices of physicians $47,120.
AAPC's 2026 salary report — a survey of self-selected, mostly member respondents — put CIC holders at a $76,354 average for 2025, up 41.9% since 2020, the biggest gain in the report.
Treat AAPC survey averages as what certified survey respondents reported, never as BLS data or market medians.
Outlook: BLS projects employment of medical records specialists to grow 8% from 2025 to 2035, much faster than the average for all occupations.
The full BLS tables live on our coder salary page.
Career information, not coding, billing-compliance, legal or tax advice — confirm exam and credential details with AHIMA or AAPC, and pay figures with BLS.